The link between having to make a big decision and feeling super stressed is a no-brainer—we all get pretty anxious when deciding whether we should accept a new job or even go on a date with that guy we met online.

It turns out, however, that our decision-making skills may come down to one thing: our saliva. A study performed by the University of Granada discovered that cortisol levels in spit are associated with a woman's ability to make good decisions in stressful situations.

Researchers exposed women to a anxiety-inducing scenario via virtual reality and found that those who were not as skilled in decision-making had lower levels of cortisol—which is also known as the "stress hormone"—compared to women with higher levels.

So, while higher levels of cortisol might help us make key decisions (and make us feel stressy), lower levels may help keep us stay relaxed. Either way, we're pretty fascinated to know that something as simple as spit could play such a key role in some of the more important moments in our lives. That's science for you!